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Message from discussion Overlay a coloured boundary on a gray scale image
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David Fanning  
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 More options Oct 12 2012, 8:35 am
Newsgroups: comp.lang.idl-pvwave
From: David Fanning <n...@dfanning.com>
Date: Fri, 12 Oct 2012 06:35:42 -0600
Local: Fri, Oct 12 2012 8:35 am
Subject: Re: Overlay a coloured boundary on a gray scale image
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titan writes:
> probably my question is not clear :( and I'm sorry for this.
> I try to explain it better:

> I'm able to read a shapefile from which I'm able to obtain the corresponding image which is a binary one. Then I can extract those subscripts values where the boundary is

> boundary_index = WHERE(boundary_array NE 0)

> my gray scale image has the same dimension of the boundary image and as a consequence I can draw the line over it (in white)

> image[boundary_index]=255

> What I would like to do i to understand if I could draw this line not in white but in another color, for example yellow.

> Is there this possibility?

I presume you are using indexed color to display your image.
Simply load your image colors into indices 0 to 254 and
use color index 255 to load whatever color you like.
I would do it like this:

   LoadCT, 0, NColors=254
   TVLCT, 255, 255, 0, 255 ; Yellow in index 255
   scaledImage = BytScl(image, TOP=254
   scaledImage[bounary_index] = 255
   cgImage, scaledImage

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thos speakest truth.")


 
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